What contents are in (oldBoard) at beginning of function / how does this information become "Oldboard"?

Add tests for:

rendering a cell Cell properly: this is a straightforward test, and could even be a snapshot test
rendering the starter Board: you could write this as a snapshot test, but you’d need to make sure the initial board configuration was predictable in the tests. How could you do that?
handling cell-clicking: this is harder test, but has the most value. You’ll need to do a non-shallow render of the Board, then find a cell, and ensure that clicking it causes the right cells to flip.
checking for a win and showing a “You won!” message.

Tried multiple solutions I found online, but still keep coming back to these errors.

Three errors on initial page load:

Failed to load resource: the server responded with a status of 404 ()
main.d6b55400.css:1

Failed to load resource: the server responded with a status of 404 ()
main.71071951.js:1

Failed to load resource: the server responded with a status of 404 ()
main.d6b55400.css:1

Another 2 errors when the page is reloaded

GET https://dlmedeiro.github.io/dlmedeiro/Lights-Out/static/js/main.71071951.js net::ERR_ABORTED 404
GET https://dlmedeiro.github.io/dlmedeiro/Lights-Out/static/css/main.d6b55400.css net::ERR_ABORTED 404

1. CreateBoard Function: syntax of innerArray.push(Math.random() < chanceLightsStartsOn)

I know this is assigning to new cell as either on or off, then the rest of the function creates the board or arrays. Not understanding the "<" syntax

3, 5, 7, 9